Sodalite: The rare blue mineral used as a gem. Geology
Sodalite is a rare rockforming mineral best known for its blue to blueviolet color. It has a chemical composition of Na 4 Al 3 Si 3 O 12 Cl and is a member of the feldspathoid mineral group. Highquality sodalite is used as a gemstone, a sculptural material, and an architectural stone. Sodalite occurs in igneous rocks that crystallized from ...